Pump fixing structure and pump

ABSTRACT

A pump fixing structure may include a pump including a pump part, motor part, and a fixing base. The pump part may include an outlet port, inlet port and an impeller. The motor part may rotate the impeller and may include a stator which includes a drive coil and a stator core; and a motor case integrally molded with the stator, the motor case structuring an outer peripheral face of the motor part. The outer peripheral face is formed in a substantially circular truncated cone face shape having a draft angle for drawing the motor case from a die. The pump part may include a fixed part fixed to the fixing base. The fixing base may include a bent metal plate and is provided with a motor support part disposed on a lower side. A buffer member may be disposed between the motor part and the motor support part.

CROSS REFERENCE TO RELATED APPLICATIONS

This is the U.S. national stage of application No. PCT/JP2013/065641 filed on Jun. 6, 2013. Priority under 35 U.S.C. §119(a) and 35 U.S.C. §365(b) is claimed from Japanese Application No. 2012-136593, filed Jun. 18, 2012, the disclosure of which are also incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to a pump fixing structure for fixing a pump to a fixing base. Further, the present invention relates to a pump which structures the pump fixing structure.

BACKGROUND

Conventionally, a pump fixing device for fixing a pump to a base has been known (see, for example, Patent Literature 1). In Patent Literature 1, a pump is fixed to a base through an abutting part. Further, the pump includes a pump part having an outlet port and an inlet port for fluid, and a motor part for rotating an impeller which is disposed in an inside of the pump part. An outer peripheral face of the motor part is formed in a cylindrical face shape. The abutting part and the base are formed by bending a metal plate in a predetermined shape. Further, the abutting part is structured of a curved face part in a circular arc shape to which an outer peripheral face of the motor part formed in a cylindrical face shape is fixed, side face parts which are bent to a lower direction from both ends of the curved face part, and bottom face parts extended from lower ends of the side face parts in a horizontal direction. The base is structured of an upper face part to which the bottom face parts of the abutting part are fixed and side face parts which are bent from both ends of the upper face part to a lower direction.

Further, conventionally, as a pump including a pump part having an outlet port and an inlet port for fluid and a motor part for rotating an impeller which is disposed in an inside of the pump part, a pump has been known which includes a stator structuring a motor part and a mold part made of resin which covers the stator (see, for example, Patent Literature 2). In the pump described in Patent Literature 2, the mold part is integrally formed with the stator and structures an outer peripheral face of the motor part. In a pump having a mold part which is integrally formed with a stator like the pump described in Patent Literature 2, an outer peripheral face of the motor part is commonly formed in a circular truncated cone face shape having a draft angle for drawing out the mold part from a die which is used when the stator and the mold part are integrally molded.

PATENT LITERATURE

[PTL 1] Examined Utility Model Application Publication Hei 8-7199

[PTL 2] Japanese Patent Laid-Open No. 2008-109848

In the pump described in Patent Literature 1, a rotor structuring the motor part is rotated and thus vibration is easily occurred in the motor part. On the other hand, in this pump, an outer peripheral face of the motor part is fixed to the curved face part of the abutting part which is formed of a metal plate and the bottom face parts of the abutting part are fixed to the base and thus vibration occurred in the motor part is easily transmitted to the base through the abutting part. Therefore, in order to suppress transmission of vibration from the motor part to the base, it is preferable that a space is provided between an upper face part of the base and the motor part and, for example, the pump part is fixed to a side face part of the base. However, even in this case, when a fixed part of the pump part fixed to the side face part of the base is deformed with a lapse of time, the upper face part of the base and the motor part may be contacted with each other and thus vibration of the motor part may be transmitted to the base.

SUMMARY

In view of the problem described above, at least an embodiment of the present invention provides a pump fixing structure for fixing a pump having a pump part and a motor part to a fixing base, the pump fixing structure being capable of suppressing transmission of vibration from the motor part to the fixing base even when a fixed part of the pump part which is fixed to the fixing base is deformed due to a lapse of time. Further, at least an embodiment of the present invention provides a pump which structures the pump fixing structure.

To achieve the above, at least an embodiment of the present invention provides a pump fixing structure for fixing a pump to a fixing base. The pump includes a pump part which has an outlet port and an inlet port for fluid and is disposed with an impeller in its inside, and a motor part for rotating the impeller. The motor part includes a stator having a drive coil and a stator core around which the drive coil is wound, and a motor case which is formed of resin and is integrally molded with the stator to structure an outer peripheral face of the motor part. The outer peripheral face of the motor part is formed in a substantially circular truncated cone face shape having a draft angle for drawing the motor case from a die used when the stator and the motor case are integrally molded. The pump part is provided with a fixed part which is fixed to the fixing base, the fixing base is formed by bending a metal plate and is provided with a motor support part disposed on a lower side with respect to the motor part, and a buffer member having elasticity is disposed between the motor part and the motor support part.

In the pump fixing structure in accordance with at least an embodiment of the present invention, a buffer member having elasticity is disposed between the motor support part disposed on a lower side with respect to the motor part and the motor part. Therefore, according to at least an embodiment of the present invention, even when the fixed part of the pump part which is fixed to the fixing base is deformed with a lapse of time, the motor part is prevented from contacting with the motor support part of the fixing base. Therefore, in at least an embodiment of the present invention, even when the fixed part of the pump part which is fixed to the fixing base is deformed with a lapse of time, transmission of vibration from the motor part to the fixing base is suppressed.

Further, in the pump fixing structure in accordance with at least an embodiment of the present invention, a buffer member is disposed between the motor support part disposed on a lower side with respect to the motor part and the motor part. Therefore, even when an outer peripheral face of the motor part is formed in a substantially circular truncated cone face shape having a draft angle, the motor part is supported by the buffer member in a stable state.

In at least an embodiment of the present invention, for example, the fixing base is formed in a substantially angular groove shape which is provided with the motor support part formed in a substantially rectangular shape and side face parts which are bent in a lower direction from each of a pair of opposite sides of the motor support part formed in the substantially rectangular shape, the fixed part is fixed to one of two side face parts, a space is formed between the motor part and the motor support part, and the motor part and the motor support part are contacted with the buffer member. In this case, it is preferable that a second buffer member having elasticity is disposed between the side face part and the fixed part. According to this structure, vibration of the motor part is suppressed from being transmitted to the fixing base through the pump part by the second buffer member.

In at least an embodiment of the present invention, it is preferable that the motor support part is formed with an engaging hole with which a part of the buffer member is engaged, and the buffer member is formed with an engaging projection which is engaged with the engaging hole. According to this structure, positional displacement of the buffer member with respect to the motor support part is prevented.

In a pump which structures the pump fixing structure in accordance with at least an embodiment of the present invention, it is preferable that the motor part includes a connector for supplying an electric current to the drive coil, the connector is integrated with the motor case so as to protrude from the outer peripheral face of the motor case when the stator and the motor case are integrally molded and, when viewed in an axial direction of the motor part, a gate mark which is a mark of a gate of the die is formed on the motor case on an opposite side to the connector so as to interpose an axial center of the motor part therebetween. In this case, a shape of the motor case when viewed in an axial direction of the motor part can be set to be line symmetric with respect to a line connecting the center of the connector and the gate mark. Therefore, when the stator and the motor case are to be integrally molded, resin is easily flowed uniformly from the gate toward a portion where the connector is disposed.

In at least an embodiment of the present invention, it is preferable that the motor case is formed with a gate mark formed part where the gate mark is formed on its surface so as to protrude to an outer side in a radial direction of the motor part. According to this structure, a wall thickness of the gate mark formed part can be made larger than other portions and thus, when the stator and the motor case are to be integrally molded, resin is easily flowed from the gate into an inside of the die.

In a pump which structures the pump fixing structure in accordance with at least an embodiment of the present invention, it is preferable that the motor case is formed of BMC (Bulk Molding Compound). In this case, heat radiation property and vibration absorption property of the motor case are enhanced.

In a pump which structures the pump fixing structure in accordance with at least an embodiment of the present invention, the motor part includes a rotor which is disposed on an inner peripheral side with respect to the stator, the stator core is provided with an outer peripheral core part in a substantially cylindrical shape which is disposed on an outer peripheral side with respect to the drive coil, and at least a part of a gate mark which is a mark of a gate of the die and at least a part of the outer peripheral core part are overlapped with each other in a radial direction of the motor part. In this case, when the stator and the motor case are to be integrally molded, injection pressure of the resin is hard to be directly applied to the drive coil and the like. Therefore, when the stator 12 and the motor case 14 are to be integrally molded, damage of the drive coils 22 and the like can be prevented.

As described above, in the pump fixing structure in accordance with at least an embodiment of the present invention, even when the fixed part of the pump part which is fixed to the fixing base is deformed with a lapse of time, transmission of vibration from the motor part to the fixing base is suppressed. Further, in the pump in accordance with at least an embodiment of the present invention, effects can be attained such that, when the stator and the motor case are to be integrally molded, resin is easily flowed uniformly from the gate toward a portion where the connector is disposed.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements are numbered alike in several Figures, in which:

FIG. 1 is a perspective view showing a pump fixing structure in accordance with an embodiment of the present invention.

FIG. 2 is a side view showing the pump fixing structure in FIG. 1 which is viewed in another direction.

FIG. 3 is a rear view showing the pump fixing structure which is viewed in the “E-E” direction in FIG. 2.

FIG. 4 is a cross-sectional view showing the “F-F” cross section in FIG. 3.

FIG. 5 is a perspective view showing a state that a stator shown in FIG. 4 is taken out from a motor case.

FIG. 6 is a side view showing a state that the stator and the motor case shown in FIG. 5 are integrated with each other.

DESCRIPTION OF EMBODIMENTS

At least an embodiment of the present invention will be described below with reference to the accompanying drawings.

(Structure of Pump Fixing Structure)

FIG. 1 is a perspective view showing a pump fixing structure 1 in accordance with an embodiment of the present invention. FIG. 2 is a side view showing the pump fixing structure 1 in FIG. 1 which is viewed in another direction. FIG. 3 is a rear view showing the pump fixing structure 1 which is viewed in the “E-E” direction in FIG. 2. FIG. 4 is a cross-sectional view showing the “F-F” cross section in FIG. 3. FIG. 5 is a perspective view showing a state that a stator 12 shown in FIG. 4 is taken out from a motor case 14. FIG. 6 is a side view showing a state that the stator 12 and the motor case 14 shown in FIG. 5 are integrated with each other.

The pump fixing structure 1 in this embodiment is a structure for fixing a pump 2 to a fixing base 3 and includes the pump 2 and the fixing base 3 to which the pump 2 is fixed. In the following descriptions, as shown in FIGS. 2 and 3, in respective three directions perpendicular to each other, an axial line direction of a motor part 7 is referred to as an “X” direction, a direction which is perpendicular to the axial line direction of the motor part 7 and parallel to an upper face part 3 a of the fixing base 3 is referred to as a “Y” direction, and a direction which is perpendicular to the axial line direction of the motor part 7 and perpendicular to the upper face part 3 a of the fixing base 3 is referred to as a “Z” direction. Further, the “X” direction is referred to as a front and rear direction, the “Y” direction is referred to as a right and left direction, and the “Z” direction is referred to as an upper and lower direction. Further, in FIGS. 2 and 3 and the like, the “X1” direction side is referred to as a “front” side, the “X2” direction side is a “rear” (back) side, the “Y1” direction side is a “right” side, the “Y2” direction side is a “left” side, the “Z1” direction side is an “upper” side, and the “Z2” direction side is a “lower” side.

The pump 2 is a pump which is referred to as a canned pump, which includes a pump part 6 in which an impeller 5 a (see FIG. 4) is disposed in its inside and a motor part 7 for rotating the impeller 5 a. The pump part 6 structures a front end side portion of the pump 2 in an axial line direction of the motor part 7, and the motor part 7 structures a rear end side portion of the pump 2 in the axial line direction of the motor part 7. The impeller 5 a structures a front end side portion in an axial line direction of an impeller member 5.

The pump part 6 includes a pump case 9 which is formed with an outlet port 9 a and an inlet port 9 b for fluid. The outlet port 9 a is formed in a cylindrical tube shape which protrudes toward an obliquely left upper direction and the inlet port 9 b is formed in a cylindrical tube shape which protrudes toward a front direction. A rear end side of the pump case 9 is formed with a flange part 9 c for fixing the motor part 7 to the pump part 6 and for fixing the pump 2 to the fixing base 3. A lower end side of the flange part 9 c is formed as a fixed part 9 d which is fixed to the fixing base 3. An inside of the pump case 9 is a part of a pump chamber 10 as shown in FIG. 4.

The motor part 7 includes a rotor 11, a stator 12, a partition member 13 which defines the pump chamber 10 together with the pump case 9, and a motor case 14 which structures an outer peripheral face of the motor part 7. The rotor 11 is disposed on an inner peripheral side with respect to the stator 12. In other words, the motor structuring the motor part 7 is an inner rotor type motor.

The partition member 13 is formed of resin material. Further, the partition member 13 is formed in a bottomed cylindrical tube shape with a flange and is disposed between the rotor 11 and the stator 12. The flange part 13 a of the partition member 13 is abutted with a flange part 9 c of the pump case 9, and the pump chamber 10 is formed of an inside of the pump case 9 and an inside of the partition member 13. A seal member (“O”-ring) 15 is disposed between the flange part 9 c and the flange part 13 a for securing sealability of the pump chamber 10.

The rotor 11 includes a drive magnet 16 and a cylindrical shaped sleeve 17. A rear end side portion of the impeller member 5 is a holding part 5 b formed in a substantially cylindrical shape. The holding part 5 b structures a part of the rotor 11, and the drive magnet 16 is fixed to an outer peripheral face of the holding part 5 b and the sleeve 17 is fixed to an inner peripheral face of the holding part 5 b. The rotor 11 is rotatably supported by a fixed shaft 18 which is fixed to the pump case 9 and the partition member 13 with the front and rear direction as an axial direction. Two thrust bearings 19 are attached to the fixed shaft 18 so as to sandwich the sleeve 17 in the front and rear direction. The rotor 11 is disposed in an inside of the pump chamber 10.

The stator 12 includes a drive coil 22, a stator core 23 and a bobbin 24, and is formed in a substantially cylindrical tube shape as a whole. The stator core 23 is, for example, a laminated core which is formed by laminating thin magnetic plates made of magnetic material, and the stator core 23 is provided with an outer peripheral core part 23 a in a substantially cylindrical shape which structures an outer peripheral face of the stator core 23 and a plurality of salient pole parts 23 b which protrude from the outer peripheral core part 23 a to an inner side in a radial direction (see FIG. 5). A width of the outer peripheral core part 23 a in a front and rear direction is set to be equal to a width of the salient pole part 23 b in the front and rear direction.

The bobbin 24 is formed in a tube shape with flanges which is provided with flange parts at both ends. The drive coil 22 is wound around an outer peripheral face of the bobbin 24. The bobbin 24 around which the drive coil 22 is wound is fitted to the salient pole part 23 b from an inner side in a radial direction, and the drive coil 22 is wound around the salient pole part 23 b through the bobbin 24. Further, the bobbins 24 around which the drive coil 22 is wound are disposed on an inner peripheral side with respect to the outer peripheral core part 23 a. Both end parts of the drive coil 22 are electrically connected with terminal pins 25 which are fixed to the bobbin 24.

Circuit boards 26 and 27 provided with a drive circuit and a control circuit are fixed to a rear face side of a bottom part 13 b of the partition member 13 and are disposed on a rear end side of the stator 12. The circuit board 26 and the circuit board 27 are electrically connected with each other. The terminal pin 25 is electrically connected with the circuit board 26 by soldering or the like. Various electronic components are mounted on the circuit board 27. Further, a connector 28 for supplying an electric current to the drive coil 22 is mounted on the circuit board 27. In FIG. 6, the circuit boards 26 and 27 and the connector 28 are not shown. Further, an electric current is supplied to the drive coil 22 through the connector 28 and, in addition, exchanges of various signals and the like are performed through the connector 28.

The motor case 14 is formed of resin. Specifically, the motor case 14 is formed of BMC (Bulk Molding Compound). Further, the motor case 14 is integrally molded with the stator 12 and the partition member 13 so as to cover an outer peripheral side and a rear face side of the stator 12 and is formed in a substantially bottomed cylindrical tube shape. A die (not shown) which is used for integrally molding the stator 12 and the like with the motor case 14 is structured so as to be divided in the front and rear direction, and an outer peripheral face of the motor case 14 is formed in a substantially circular truncated cone face shape having a draft angle for drawing the motor case 14 from the die. In other words, since the outer peripheral face of the motor case 14 is an outer peripheral face of the motor part 7, the outer peripheral face of the motor part 7 is formed in a substantially circular truncated cone face shape. Specifically, the outer peripheral face of the motor part 7 is formed in a substantially circular truncated cone face shape whose outer diameter gradually becomes smaller toward the rear end side of the motor case 14.

In this embodiment, when the stator 12 and the like and the motor case 14 are to be integrally molded, the connector 28 is mounted on the circuit board 27 and the circuit boards 26 and 27 are fixed to the partition member 13. The circuit boards 26 and 27 are integrated with the motor case 14 so as to be covered by the motor case 14 when the stator 12 and the like and the motor case 14 are integrally molded. Further, when the stator 12 and the like and the motor case 14 are integrally molded, the connector 28 is integrated with the motor case 14 so that a part of the connector 28 is protruded from the outer peripheral face of the motor case 14.

A connector arrangement part 14 a where the connector 28 is disposed and a gate mark formed part 14 c where a gate mark 14 b, i.e., a mark of a gate of a die used when the stator 12 and the like and the motor case 14 are integrally molded is formed are formed on an outer peripheral side of the motor case 14 so as to protrude to an outer side in the radial direction. Further, four protruded parts 14 dfor screws for fixing the motor part 7 to the pump part 6 are formed on the outer peripheral face of the motor case 14 so as to protrude from the outer peripheral face of the motor part 7 to an outer side in the radial direction.

The connector arrangement part 14 a is protruded from the outer peripheral face of the motor part 7 to the left direction. On the other hand, the gate mark formed part 14 c is protruded to the right direction. In other words, when viewed in the front and rear direction which is an axial line direction of the motor part 7, as shown in FIG. 3, the gate mark formed part 14 c where the gate mark 14 b is formed is formed on an opposite side to the connector arrangement part 14 a interposing an axial center of the motor part 7 therebetween. In this embodiment, a shape of the motor case 14 when viewed in the axial direction of the motor part 7 is formed to be line symmetric with respect to a line connecting the center of the connector 28 with the center of the gate mark 14 b which is parallel to the right and left direction. The connector arrangement part 14 a and the gate mark formed part 14 c are formed on almost entire region of the motor case 14 in the front and rear direction. Further, a left side face of the connector arrangement part 14 a and a right side face of the gate mark formed part 14 c are substantially parallel to the “Z-X” plane which is structured of the “Z” direction and the “X” direction.

The gate mark 14 b is formed so as to slightly protrude to the right direction from the right side face (surface) of the gate mark formed part 14 c. Further, the gate mark 14 b is formed at a center position in the upper and lower direction of the right side face of the gate mark formed part 14 c and is formed in a predetermined range in the front and rear direction of the right side face of the gate mark formed part 14 c. As shown in FIG. 6, a part of the gate mark 14 b is overlapped with the outer peripheral core part 23 a when viewed in the right and left direction. In other words, a part of the gate mark 14 b is overlapped with the outer peripheral core part 23 a in the radial direction of the motor part 7. Specifically, a part on the front end side of the gate mark 14 b is overlapped with the outer peripheral core part 23 a in the radial direction of the motor part 7.

Four protruded parts 14 d for screws are formed so as to respectively protrude from the outer peripheral face of the motor part 7 toward an obliquely right upper direction, an obliquely right lower direction, an obliquely left upper direction and an obliquely left lower direction. The protruded part 14 d for a screw is formed with a screw hole 14 e with which a screw 30 is engaged. The motor part 7 is fixed to the pump part 6 by four screws 30.

The fixing base 3 is formed by bending one metal plate made of a steel plate or the like. Further, the fixing base 3 is structured of an upper face part 3 a, which is formed in a substantially rectangular shape and is provided with a flat face as a motor support part, side face parts 3 b which are disposed on both sides in the front and rear direction and are formed so as to be bent from a pair of opposite sides of the upper face part 3 a to a lower direction opposite to the direction that the pump 2 is placed, and bottom face parts 3 c forming flanges which are formed so as to be bent from lower ends of the side face parts 3 b to an outer direction in the front and rear direction. The fixing base 3 is formed in a substantially rectangular groove shape in which the upper face part 3 a is a bottom face and the side face parts 3 b are wall faces. The bottom face parts 3 c are fixed to a frame or the like of a predetermined device in which the pump 2 is used.

The side face part 3 b disposed on the front side of the two side face parts 3 b is fixed by screws 31 to the fixed part 9 d of the pump case 9 which is located on a lower side relative to the outer peripheral face of the motor part 7. The fixed part 9 d is located on a lower side relative to the outer peripheral face of the motor case 14 and, in a state that the fixed part 9 d is fixed to the side face part 3 b, a space is formed between the upper face part 3 a and the outer peripheral face of the motor part 7 facing the upper face part 3 a. The upper face part 3 a is disposed on a lower side with respect to the motor part 7. A buffer member 34 is disposed between the lower end of the motor part 7 and the upper face of the upper face part 3 a. In other words, an abutting part 14 f provided on a lower end of the motor part 7, which is provided on a portion except the connector arrangement part 14 a, the gate mark 14 b, the gate mark formed part 14 c and the protruded parts 14 d for screws protruded to an outer side in the radial direction from the cylindrical outer peripheral face of the motor part 7, and a flat face of the upper face part 3 a are disposed so as to face each other and the buffer member 34 is disposed between the abutting part 14 f of the motor part 7 and the upper face part 3 a. In a state that the abutting part 14 f and the buffer member 34 are abutted with each other, the connector arrangement part 14 a, the gate mark 14 b, the gate mark formed part 14 cand the protruded parts 14 d for screws protruded to an outer side in the radial direction from the cylindrical outer peripheral face of the motor part 7 are provided at positions so as not to contact with the buffer member 34 and the upper face part 3 a. As described above, the abutting part 14 f formed of a flat outer peripheral face of the motor part 7 and the buffer member 34 are disposed so as to face each other and thus the motor part 7 and the fixing base 3 can be closely disposed and it is suitable to reduce the size of the device. In addition, in this embodiment, the outlet port 9 a is provided so as to protrude toward an upper side with respect to the outer peripheral face of the motor part 7 and the abutting part 14 f is provided on the outer peripheral face on a lower side of the motor part 7, and the fixed part 9 d is provided so as to protrude toward a lower side with respect to the outer peripheral face of the motor part 7. Therefore, a height of the pump 2 fixed to the fixing base 3 can be structured low and thus it is suitable to reduce the size. Further, a buffer member 35 as a second buffer member is disposed between a front face of the side face part 3 b disposed on the front side and a rear face of the fixed part 9 d.

The buffer member 34 is formed of elastic material having elasticity. The buffer member 34 in this embodiment is, for example, a rubber bushing formed of rubber. The buffer member 34 is structured of a large diameter part 34 a formed in a columnar shape and a small diameter part 34 b as an engaging projection which is formed in a columnar shape whose outer diameter is smaller than that of the large diameter part 34 a. The buffer member 34 is formed in a stepped columnar shape. The small diameter part 34 b is engaged with a circular engaging hole formed in the upper face part 3 a of the fixing base 3 and the large diameter part 34 a is disposed on the upper face side of the upper face part 3 a. As shown in FIG. 2, a space is formed between the motor part 7 and the upper face part 3 a. Further, the lower end of the motor part 7 and the upper face of the large diameter part 34 a are contacted with each other and the upper face of the upper face part 3 a and the under face of the large diameter part 34 a are contacted with each other. In this embodiment, the engaging hole formed in the upper face part 3 a penetrates through the upper face part 3 a and a lower end side of the small diameter part 34 b is protruded to a lower side relative to the under face of the upper face part 3 a.

The buffer member 35 is formed of elastic material having elasticity. The buffer member 35 in this embodiment is, for example, a rubber plate formed of rubber and is formed in a flat plate shape. The buffer member 35 is fixed between the fixed part 9 d and the side face part 3 b by the screw 31 in a state that the buffer member 35 is sandwiched between the fixed part 9 d and the side face part 3 b.

Principal Effects in this Embodiment

As described above, in this embodiment, the buffer member 34 is disposed between the upper face part 3 a of the fixing base 3 and the motor part 7. Therefore, in this embodiment, vibration transmitted from the motor part 7 to the upper face part 3 a can be suppressed by the buffer member 34. Further, in this embodiment, the buffer member 35 is disposed between the side face part 3 b of the fixing base 3 and the fixed part 9 d of the pump case 9 and thus vibration of the motor part 7 can be suppressed from being transmitted to the side face part 3 b through the pump part 6 by the buffer member 35.

Further, in this embodiment, the buffer member 34 is disposed between the upper face part 3 a and the motor part 7 and thus, even when the fixed part 9 d of the pump case 9 fixed to the side face part 3 b of the fixing base 3 is deformed with a lapse of time, the motor part 7 can be prevented from contacting with the upper face part 3 a. Therefore, in this embodiment, even when the fixed part 9 d is deformed with a lapse of time, transmission of vibration from the motor part 7 to the fixing base 3 can be suppressed. In addition, in this embodiment, the buffer member 34 is disposed between the upper face part 3 a and the motor part 7 and thus, even when the outer peripheral face of the motor part 7 is formed in a substantially circular truncated cone face shape having a draft angle, the motor part 7 can be supported by the buffer member 34 in a stable state.

In this embodiment, the small diameter part 34 b of the buffer member 34 is engaged with the engaging hole formed in the upper face part 3 a. Therefore, in this embodiment, positional displacement of the buffer member 34 with respect to the upper face part 3 a can be prevented.

In this embodiment, when viewed in the front and rear direction which is the axial direction of the motor part 7, the gate mark formed part 14 c where the gate mark 14 b is formed is formed on an opposite side to the connector arrangement part 14 a so as to interpose the axial center of the motor part 7 therebetween, and a shape of the motor case 14 when viewed in the axial line direction of the motor part 7 is formed to be line symmetric with respect to a line connecting the center of the connector 28 with the center of the gate mark 14 b which is parallel to the right and left direction. Therefore, in this embodiment, when the stator 12 and the like and the motor case 14 are to be integrally molded, resin is easily flowed uniformly from a gate of the die toward a portion where the connector 28 is disposed. Further, in this embodiment, the gate mark formed part 14 c is formed so as to protrude to an outer side in the radial direction of the motor part 7 and a wall thickness of the gate mark formed part 14 c is set to be thicker than that of the other portion of the motor case 14 except the connector arrangement part 14 a and the protruded parts 14 d for screws. Therefore, in this embodiment, when the stator 12 and the like and the motor case 14 are to be integrally molded, resin is easily flowed into an inside of the die from the gate.

In this embodiment, a part of the gate mark 14 b is overlapped with the outer peripheral core part 23 a in the radial direction of the motor part 7. Therefore, when the stator 12 and the like and the motor case 14 are to be integrally molded, injection pressure of resin is hard to be directly applied to the drive coils 22 and the like. As a result, according to this embodiment, when the stator 12 and the like and the motor case 14 are to be integrally molded, damage of the drive coils 22 can be prevented.

In this embodiment, the motor case 14 is formed of BMC. Therefore, according to this embodiment, heat radiation property and vibration absorption property of the motor case 14 can be enhanced.

Other Embodiments

Although the present invention has been shown and described with reference to a specific embodiment, various changes and modifications will be apparent to those skilled in the art from the teachings herein.

In the embodiment described above, the buffer member 34 is formed in a stepped columnar shape comprised of the large diameter part 34 a and the small diameter part 34 b. However, the present invention is not limited to this embodiment. For example, the buffer member 34 may be formed in a columnar shape comprised of only the large diameter part 34 a or may be formed in a flat plate shape or in a block shape. In this case, for example, the buffer member 34 is fixed to an upper face of the upper face part 3 a of the fixing base 3 by an adhesive or the like.

In the embodiment described above, the buffer member 35 is disposed between the side face part 3 b of the fixing base 3 and the fixed part 9 d of the pump case 9. However, the present invention is not limited to this embodiment. For example, when vibration of the motor part 7 is hard to be transmitted to the side face part 3 b through the pump part 6, no buffer member 35 may be disposed between the side face part 3 b and the fixed part 9 d.

In the embodiment described above, the motor case 14 is formed of BMC, but the motor case 14 may be formed of resin other than BMC. Further, in the embodiment described above, when viewed in the front and rear direction which is the axial direction of the motor part 7, the gate mark 14 b is formed on the opposite side to the connector arrangement part 14 a so as to interpose the axial center of the motor part 7 therebetween, but the gate mark 14 b may be formed at another arbitrary position.

In the embodiment described above, a part of the gate mark 14 b is overlapped with the outer peripheral core part 23 a in the radial direction of the motor part 7. However, the present invention is not limited to this embodiment. For example, all of the gate mark 14 b may be overlapped with the outer peripheral core part 23 a in the radial direction of the motor part 7. In this case, when the stator 12 and the like and the motor case 14 are to be integrally molded, damage of the drive coils 22 and the like can be prevented effectively. In accordance with an embodiment of the present invention, it may be structured that the gate mark 14 b and the outer peripheral core part 23 a are not overlapped with each other in the radial direction of the motor part 7.

While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention.

The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. 

1. A pump fixing structure comprising: a pump comprising a pump part and a motor part; and a fixing base to which the pump is fixed; wherein the pump part comprises an outlet port and an inlet port for fluid and an impeller disposed in an inside of the pump part; wherein the motor part is structured to rotate the impeller and comprises: a stator which comprises a drive coil and a stator core around which the drive coil is wound; and a motor case which is formed of resin and is integrally molded with the stator, the motor case structuring an outer peripheral face of the motor part; wherein the outer peripheral face of the motor part is formed in a substantially circular truncated cone face shape having a draft angle for drawing the motor case from a die which is used when the stator and the motor case are integrally molded; wherein the pump part comprises a fixed part which is fixed to the fixing base; wherein the fixing base comprises a bent metal plate and is provided with a motor support part disposed on a lower side with respect to the motor part; and wherein a buffer member having elasticity is disposed between the motor part and the motor support part.
 2. The pump fixing structure according to claim 1, wherein the fixing base is formed in a substantially angular groove shape which is provided with the motor support part formed in a substantially rectangular shape and side face parts which are bent in a lower direction from each of a pair of opposite sides of the motor support part formed in the substantially rectangular shape, the fixed part is fixed to one of two side face parts, a space is formed between the motor part and the motor support part, and the motor part and the motor support part arc contacted with contact the buffer member.
 3. The pump fixing structure according to claim 2, wherein a second buffer member having elasticity is disposed between the side face part and the fixed part.
 4. The pump fixing structure according to claim 3, wherein the motor support part is formed with an engaging hole with which a part of the buffer member is engaged, and the buffer member is formed with an engaging projection which is engaged with the engaging hole.
 5. A pump comprising: a pump part comprising an outlet port and an inlet port for fluid and an impeller disposed in an inside of the pump part; and a motor part structured to rotate the impeller; wherein the pump is fixed to a fixing base, which is formed by bending a metal plate and is provided with a motor support part disposed on a lower side with respect to the motor part, through a buffer member having elasticity disposed between the motor part and the motor support part; wherein the motor part comprises: a stator which comprises a drive coil and a stator core around which the drive coil is wound; and a motor case which is formed of resin and is integrally molded with the stator, the motor case structuring an outer peripheral face of the motor part; wherein the outer peripheral face of the motor part is formed in a substantially circular truncated cone face shape having a draft angle for drawing the motor case from a die which is used when the stator and the motor case are integrally molded; wherein the pump part comprises a fixed part which is fixed to the fixing base; wherein the motor part comprises a connector for supplying structured to supply an electric current to the drive coil, the connector is integrated with the motor case so as to protrude from an outer peripheral face of the motor case when the stator and the motor case are integrally molded, and when viewed in an axial direction of the motor part, a gate mark which is a mark of a gate of the die is formed on the motor case on an opposite side to the connector so as to interpose an axial center of the motor part therebetween.
 6. The pump according to claim 5, wherein the motor case is formed with a gate mark formed part where the gate mark is formed on its surface so as to protrude to an outer side in a radial direction of the motor part.
 7. A pump comprising: a pump part comprising an outlet port and an inlet port for fluid and an impeller which is disposed in an inside of the pump part; and a motor part structured to rotate the impeller; wherein the pump is fixed to a fixing base, which is formed by bending a metal plate and is provided with a motor support part disposed on a lower side with respect to the motor part, through a buffer member having elasticity disposed between the motor part and the motor support part; wherein the motor part comprises: a stator which comprises a drive coil and a stator core around which the drive coil is wound; and a motor case which is formed of resin and is integrally molded with the stator, the motor case structuring an outer peripheral face of the motor part; wherein the outer peripheral face of the motor part is formed in a substantially circular truncated cone face shape having a draft angle for drawing the motor case from a die which is used when the stator and the motor case are integrally molded; wherein the pump part comprises a fixed part which is fixed to the fixing base; and wherein the motor case is formed of BMC (Bulk Molding Compound).
 8. A pump comprising: a pump part comprising an outlet port and an inlet port for fluid and comprising an impeller which is disposed in an inside of the pump part; and a motor part structured to rotate the impeller; wherein the pump is fixed to a fixing base, which is formed in a substantially angular groove shape provided with a motor support part formed in a substantially rectangular shape and disposed on a lower side relative to the motor part, and side face parts which are bent in a lower direction from each of a pair of opposite sides of the motor support part formed in the substantially rectangular shape, through a buffer member having elasticity disposed between the motor part and the motor support part; wherein the motor part comprises: a stator which comprises a drive coil and a stator core around which the drive coil is wound; and a motor case which is formed of resin and is integrally molded with the stator, the motor case structuring an outer peripheral face of the motor part; wherein the outer peripheral face of the motor part is formed in a substantially circular truncated cone face shape having a draft angle for drawing the motor case from a die which is used when the stator and the motor case are integrally molded; wherein the pump part comprises a fixed part which is fixed to the fixing base; wherein the fixed part is fixed to one of the side face parts of the fixing base, wherein a space is formed between the motor part and the motor support part; wherein the motor part and the motor support part contact the buffer member; wherein a second buffer member having elasticity is disposed between the side face part and the fixed part; wherein the motor part comprises a rotor which is disposed on an inner peripheral side with respect to the stator, the stator core comprises an outer peripheral core part in a substantially cylindrical shape which is disposed on an outer peripheral side with respect to the drive coil, and at least a part of a gate mark which is a mark of a gate of the die and at least a part of the outer peripheral core part are overlapped with each other in a radial direction of the motor part.
 9. The pump fixing structure according to claim 1, wherein the pump part comprises a pump case which is formed with the outlet port and the inlet port, the pump case is formed with a flange part for fixing the motor case, the flange part protrudes to an outer side in a radial direction relative to an outer peripheral face of the motor case, and a side face on a motor case side of the flange part which is protruded to the outer side is the fixed part which is fixed to the fixing base.
 10. The pump fixing structure according to claim 9, wherein the fixing base is formed in a shape which is provided with the motor support part to support the outer peripheral face of the motor case and side face parts which are bent from both sides of the motor support part, one of the side face parts of the fixing base is fixed to the flange part, a space is formed between the outer peripheral face of the motor case and the motor support part, and the outer peripheral face and the motor support part contact the buffer member.
 11. The pump fixing structure according to claim 10, wherein a second buffer member having elasticity is disposed between the side face part and the flange part.
 12. The pump fixing structure according to claim 10, wherein a flange part of a partition member which defines a pump chamber together with the pump case is abutted with the flange part of the pump case and thereby the pump chamber is formed by an inside of the pump case and an inside of the partition member, a rotor which faces the stator through the partition member is rotationally supported on an inner side with respect to the partition member, the motor case is integrally molded with the stator and the partition member formed in a bottomed cylindrical shape, and a plurality of protruded parts for screws to fix the motor part to the flange part of the pump case is formed on the outer peripheral face of the motor case.
 13. The pump fixing structure according to claim 10, wherein the motor part comprises a connector structured to supply an electric current to the drive coil; the connector is integrated with the motor case so as to protrude from an outer peripheral face of the motor case when the stator and the motor case are integrally molded; and when viewed in an axial direction of the motor part, a gate mark which is a mark of a gate of the die is formed on the motor case on an opposite side to the connector so as to interpose an axial center of the motor part therebetween.
 14. The pump fixing structure according to claim 13, wherein the motor case is formed with a gate mark formed part where the gate mark is formed on its surface so as to protrude to an outer side in a radial direction of the motor part.
 15. The pump fixing structure according to claim 10, wherein the motor case is formed of BMC (Bulk Molding Compound).
 16. The pump fixing structure according to claim 10, wherein the motor part comprises a rotor disposed on an inner peripheral side with respect to the stator; the stator core is provided with an outer peripheral core part in a substantially cylindrical shape which is disposed on an outer peripheral side with respect to the drive coil; and at least a part of a gate mark which is a mark of a gate of the die and at least a part of the outer peripheral core part are overlapped with each other in a radial direction of the motor part. 